中国民航大学 - wichita state university · pdf fileload-displacement curves with...

中国民航大学Civil Aviation University of China

Research Progress of Crashworthiness for

Composite Structures

Reporter: Dr. Xie JiangCivil Aviation University of ChinaSep. 2nd 2015

2Civil Aviation Uni. of China Airworthiness Research Center

Organization of Aircraft Airworthiness Department of CAAC

Aircraft Airworthiness Dept.

Certification Div. Powerplant Div. Inspection Div.

North China Certif.Div.

East China Certif.Div.

Central&South Certif.Div.

Northeast Certif.Div.

Northwest Certif.Div.

Southwest Certif.Div.

XinJiang Airworth.Div.

CAMIC Airworth.Dept.

CAUC ARC

CAST AAI3

SHAACC1

Fuel&Chemical

Cerif. Center

SYAACC2

Engine Certif.

Center

Safety Supervision Management Office

1 Shang Hai Aircraft Airworthiness Certification Center of CAAC2 Shen Yang Aircraft Airworthiness Certification Center of CAAC3 China Academy of Civil Aviation Science and Technology(CAST) Aircraft Airworthiness Institute(AAI)

3Civil Aviation Uni. of China Airworthiness Research Center

Location

1. About Civil Aviation University of China(CAUC)

4Civil Aviation Uni. of China Airworthiness Research Center

Covered an area of 1.1 million m²

North / South Campus

Total build-up area: 540,000 m²

Third campus covers 467,000 ㎡, the

Airworthiness Research Center covers

34,000 ㎡.

Campus

1. About Civil Aviation University of China(CAUC)

5Civil Aviation Uni. of China Airworthiness Research Center

• Full name: Civil Aviation Aircraft AirworthinessCertification Technology and Management ResearchCenter.

• Established as a Technical Center supporting CAAC-AAD in 2007.

• Objective:

2. Overview of Airworthiness Research Center (ARC)

• Provide technical support for the decision-making of CAAC

• Conduct research on airworthiness development strategies, planning and policy

• Organize and conduct airworthiness certification technology research

• Organize and provide airworthiness training, carry out certification under entrusted and provide public services and consultancy

• Track the development trend of the international airworthiness and organize international exchange activities

• Accomplish other tasks entrusted by the CAAC

6Civil Aviation Uni. of China Airworthiness Research Center

Labs: System Safety Lab

Software and Hardware Lab

Electromagnetic Environment Lab

Crash Safety Simulation Lab High performance Cluster

HyperWorks、LS-DYNA、PAM-CRASH...

2. Overview of Airworthiness Research Center (ARC)

7Civil Aviation Uni. of China Airworthiness Research Center

25-362-SC（Boeing Model 787-8 Airplane; Crashworthiness）

3. Crashworthiness of B787

8Civil Aviation Uni. of China Airworthiness Research Center

4.Study on energy absorption of Composite Structures

Develop modeling and simulation techniques based on Finite Element Analysis

Develop methods to evaluate the energy absorbing characteristics of composite structures

9Civil Aviation Uni. of China Airworthiness Research Center

Tension test

Laminates material properties required by software

Compression test

4.1 modeling techniques: Laminates material property test

10Civil Aviation Uni. of China Airworthiness Research Center

4.1 modeling techniques: composite element test

Corrugated plate：index layups initiator

1 [ 0/90]4s 45°chamfer

2 [ 45/-45]4s 45°chamfer

3 [ 0/45/-45/90]2s 45°chamfer

Cylinder：index layups initiator

1 [0/90]3s Null

2 [0/90]3s 45°chamfer

3 [45/-45/0/90/0]s 45°chamfer

index layups initiator

1 [0/90]3s 45°chamfer

2 [45/-45]3s 45°chamfer

3 [45/-45/0/0/90/0]s 45°chamfer

Rectangular tube：

Test condition: Quasi-static load applied axially

11Civil Aviation Uni. of China Airworthiness Research Center

Test results for corrugated plate

index Layups(Deg) PeakForce (KN)

SEA(J/g)

1 [ 0/90]4s 21.47 59.65

2 [ 45/-45]4s 16.38 29.03

3 [0/45/-45/0]2s 31.66 94.19

4.1 modeling techniques: composite element test

12Civil Aviation Uni. of China Airworthiness Research Center

L—试样高度；D—试样内径；t—试

样壁厚；θ—试样铺层角。

压溃圆管试样示意图

index Layups(Deg)Peak Force (KN)

SEA(J/g)

1 [ 0/90]3s 28.81 61.782 [ 0/90]3s 24.47 58.49 3 [45/-45/0/0/90/0]s 30.73 69.68

4.1 modeling techniques: composite element test

Test results for cylinder

13Civil Aviation Uni. of China Airworthiness Research Center

index Layups(Deg) Peak Force (KN)

SEA(J/g)

1 [ 0/90]3s 25.25 44.75

2 [ ±45]3s 37.08 27.78

3 [ 45/-45/0/0/90/0]s 37.70 46.85

4.1 modeling techniques: composite element test

Test results for rectangular tube

14Civil Aviation Uni. of China Airworthiness Research Center

LS-DYNA MAT 54(ENHANCED_COMPOSITE_DAMAGE)

Simulation is able to repeat test

Load vs displacement

仿真失效模式

Peak force (KN)

Error % SEA(J/g) Error %

test 26.67 — 74.86 —simulation 29.58 10.91 77.41 3.82

4.1 modeling techniques: benchmark

15Civil Aviation Uni. of China Airworthiness Research Center

Parameters Beseline Simulation matrix

XT 2571 0，50，500，1000，1500，2000，2500，2550，2700，3500，4500

XC 1060 0，650，1000，1400，1500，1700，1800，1900，2100

SC 84.1 0.006897，69，103，120，124，131，138，207，241，345

YT 41.8 0，20，47，52，68，345，3450

YC 184 0，35，103，172，207，242，482，1379，1986，2206，2758，

3448

DFAILT 0 0.005，0.00625，0.00688，0.0075，0.01，0.015，0.04，0.08，0.1

DFAILC 0 -0.005，-0.0075，-0.00813，-0.00875，-0.01，-0.012，

-0.015，-0.02，-0.0225，-0.025，-0.03，-0.1

DFAILM 0 0.01，0.015，0.0163，0.0165，0.018，0.02， 0.03，0.06

DFAILS 0 0.006，0.01，0.037，0.05，0.1

EFS 0.95 0.01，0.1，0.2，0.3，0.4，0.5，0.6，0.7，0.8，0.9，1.0

FBRT 1.0 0，0.1，0.5，0.95

YCFAC 3.0 0，0.5，2，4，5

SOFT 0.48 0，0.05，0.4，0.55，0.565，0.575，0.6，0.8，1.0

4.1 modeling techniques: Parametric study

16Civil Aviation Uni. of China Airworthiness Research Center

Load-displacement curves with different XC values

Load-displacement curves with different DFAILC values

load-displacement curves with different SOFT values

4.1 modeling techniques: Parametric study

17Civil Aviation Uni. of China Airworthiness Research Center

Parameters

XT

XC

YT,YC

SC

DFAILC

minor

major

minor

major

major

DFAILT

DFAILM

DFAILS

SOFT

major

major

minor

major

4.1 modeling techniques: Parametric study

effects

• Simulation is not able to predict test

18Civil Aviation Uni. of China Airworthiness Research Center

4.Study on energy absorption of Composite Structures

Develop modeling and simulation techniques based on Finite Element Analysis

Develop methods to evaluate the energy absorbing characteristics of composite structures

19Civil Aviation Uni. of China Airworthiness Research Center

• Due to the scattering of material properties and mechanical tolerance, uncertain factors should be considered for designing and analyzing composite structures.

• An evaluation method for energy-absorbing characteristics of thin-walled composite structures with uncertain parameters was proposed

4.2 Evaluation method development: uncertainty

20Civil Aviation Uni. of China Airworthiness Research Center

Plackett-BurmanDOE is used to determine sensitivities of the parameters.

Plackett-BurmanDOE

Parameters boundries

DOE matrix

FE analysis

Sensitivity

4.2 Evaluation method development: uncertain sources identification

Four parameters are selected.

21Civil Aviation Uni. of China Airworthiness Research Center

Flow chart for evaluate EA characteristics of a composite cylinder with uncertain parameters

Mean S.D. Distribution

XT(MPa) 2571 144 N.D

XC(MPa) 1060 212 N.D

YC(MPa) 184 10.9 N.D

h(mm) 1.5 0.069 U.D

1.3评估方法与技术-含概率不确定参数

Parameters boundies

Parameters boundaries

DoE matrix

FE analysis

Response surface

Monte Carlo simulation

Response distribution

Parameters distribution

4.2 Evaluation method development: flow chart

22Civil Aviation Uni. of China Airworthiness Research Center

Response surfaces for SEA and Peak Force are obtained as follow:

23252264

45

96272.2480.144420.46382455.931483.3

85432.011033.022732.122801.1020277.0

24048.317386.08829.1572010317.012953.1090

YCeXTehXCeXTYCe

hYChXTXCYCeXCXTeXCh

YCXThXCSEA

R2=0.9556

24262264

46

72558.766814.126974.1791683.118459.1

23674.0022111.0068.102986.4026175.0

94235.004609.502341.12204462.049872.38

YCeXTehXCeXTYCe

hYChXTXCYCeXCXTeXCh

YCXThXCFZ

R2=0.9556

4.2 Evaluation method development: Response Surfaces

23Civil Aviation Uni. of China Airworthiness Research Center

SEA distribution

Peak Force distribution

Peak Force:• Mean: 31.78KN• Standard Deviation:3.35KN• A 95% confidence interval:

[25.89,38.03]KN

SEA:• Mean: 69.39J/g• Standard Deviation:4.92J/g• A 95% confidence interval:

[57.69,77.49]KN

4.2 Evaluation method development: Results

Black circles in the figures represent the test results

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24Civil Aviation Uni. of China Airworthiness Research Center

Thanks for your attention!

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